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在掺铒光纤环形激光器中插入饱和吸收光栅是获得稳定单纵模激光的常用方法,但跳模难以完全避免.通过干涉仪动态相移解调法将光频跳变实时转化为相位变化,发现了一种由饱和吸收动态光栅的瞬态响应特性导致的跳模新机理.实验测量了由腔长快调触发的规则跳模,获得了跳模规律及成因.此种跳模发生在调制曲线斜率最大值附近区域,通常在相邻模式之间出现,跳模前移频量约为纵模间隔.在同等调制振幅下,抽运功率越高,触发跳模所需的光频调制频率越大,所需的最小移频量也越大.实验结果给出了振动和调制条件下激光器稳定工作的条件,这为设计激光器的隔振封装和确定频率调制工作模式下的调制范围提供了实验依据.
Inserting saturated absorption grating into erbium-doped fiber ring laser is a common method to obtain stable single longitudinal mode laser, but it is difficult to avoid mode hopping completely.It is found that the jump of optical frequency is converted to phase change in real time by the method of dynamic phase shift demodulation by interferometer. A new hopping mechanism caused by the transient response of a saturated absorption dynamic grating is obtained.The regular hopping mode triggered by the cavity length fastness measurement is obtained experimentally and the cause of the hopping mode is obtained.This kind of hopping mode occurs in the modulation curve Near the maximum slope, it usually occurs between adjacent modes, and the modulo shift frequency is approximately the longitudinal mode interval. Under the same modulation amplitude, the higher the pumping power, the more the optical frequency modulation frequency required to trigger mode hopping Large, the minimum required frequency shift is larger.The experimental results show the conditions for the stable operation of the laser under vibration and modulation conditions, which provides experiments for designing the laser isolation package and determining the modulation range in the frequency modulation mode of operation in accordance with.